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fdeed55d DC |
1 | (in-package :lisp-on-lines) |
2 | ||
2b0fd9c8 | 3 | (define-layered-function display-using-description (description object component) |
f9b11956 | 4 | (:method-combination wrapping-standard) |
2b0fd9c8 DC |
5 | (:documentation |
6 | "Render the object in component, | |
7 | using DESCRIPTION, which is an occurence, an attribute, or something else entirely.")) | |
fdeed55d | 8 | |
2b0fd9c8 DC |
9 | (define-layered-method |
10 | display-using-description (d o c) | |
11 | (<:as-html "default :" o)) | |
12 | ||
fb04c0a8 | 13 | (defun make-display-function (component object |
14 | &rest properties | |
15 | &key type (line #'line-in) | |
16 | &allow-other-keys) | |
17 | "returns a function that expects a 3 argument function as its argument | |
18 | ||
19 | The function (which is usually display-using-description) will be called with the proper environment for display all set up nice n pretty like." | |
20 | ||
21 | (lambda (function) | |
22 | (let* ((description (find-occurence object))) | |
23 | ||
24 | (if description | |
1cc831d4 | 25 | (dletf (((description-type description) type) |
fb04c0a8 | 26 | ((attributes description) (or |
27 | (attributes description) | |
1cc831d4 | 28 | (list-attributes description)))) |
fb04c0a8 | 29 | ;; apply the default line to the description |
30 | (funcall-with-description | |
31 | description | |
32 | (funcall line object) | |
33 | ;; apply the passed in arguments and call display-using-description | |
34 | #'(lambda () | |
35 | (funcall-with-description | |
36 | description | |
37 | properties | |
38 | function description object component)))) | |
39 | (error "no description for ~A" object))))) | |
2b0fd9c8 DC |
40 | |
41 | (define-layered-function display (component object &rest args) | |
42 | (:documentation | |
43 | "Displays OBJECT in COMPONENT.")) | |
44 | ||
45 | (define-layered-method display ((component t) (object t) | |
1cc831d4 | 46 | &rest properties) |
0386c736 | 47 | " The default display dispatch method |
48 | ||
49 | DISPLAY takes two required arguments, | |
50 | COMPONENT : The component to display FROM (not neccesarily 'in') | |
51 | OBJECT : The 'thing' we want to display... in this case it's the component | |
52 | ||
53 | DISPLAY also takes keywords arguments which modify the DESCRIPTION, | |
54 | that is to say the parameters that come together to create the output. | |
55 | ||
56 | The default display calls out via FUNCALL-WITH-LAYERS to tche DISPLAY-USING-DESCRIPTION method." | |
1cc831d4 | 57 | (funcall (apply 'make-display-function component object properties) |
58 | 'display-using-description)) | |
fdeed55d DC |
59 | |
60 | ;;;;; Macros | |
a4e6154d | 61 | |
2b0fd9c8 DC |
62 | |
63 | (defun funcall-with-description (description properties function &rest args) | |
0386c736 | 64 | |
2b0fd9c8 | 65 | (if description |
1cc831d4 | 66 | (dletf* (((description-type description) (or |
2b0fd9c8 | 67 | (getf properties :type) |
1cc831d4 | 68 | (description-type description))) |
2b0fd9c8 | 69 | |
1cc831d4 | 70 | ((description-layers description) (append |
71 | (description-layers description) | |
2b0fd9c8 | 72 | (getf properties :layers))) |
1cc831d4 | 73 | ((description-properties description) (append (description-properties description) properties))) |
2b0fd9c8 | 74 | (funcall-with-layers |
1cc831d4 | 75 | (description-layers description) |
2b0fd9c8 | 76 | #'(lambda () |
a4e6154d DC |
77 | (contextl::funcall-with-special-initargs |
78 | (list (cons description properties)) | |
2b0fd9c8 DC |
79 | #'(lambda () |
80 | (apply function args)))))) | |
81 | (apply function args))) | |
82 | ||
2b0fd9c8 DC |
83 | (defmacro with-description ((description &rest properties) &body body) |
84 | `(funcall-with-description ,description (if ',(cdr properties) | |
85 | (list ,@properties) | |
86 | ,(car properties)) | |
87 | #'(lambda () | |
88 | ,@body))) | |
89 | ||
f9b11956 | 90 | (define-layered-function find-do-attributes (desc)) |
91 | ||
92 | (define-layered-method find-do-attributes ((description description)) | |
93 | ||
94 | (loop | |
95 | :for att | |
96 | :in (attributes description) | |
97 | :collect (let ((default (find (car (ensure-list att)) | |
98 | (default-attributes description) | |
99 | :key #'car))) | |
100 | (or default att)))) | |
101 | ||
102 | (defmacro do-attributes ((var description &optional (attributes `(find-do-attributes ,description))) &body body) | |
fdeed55d | 103 | (with-unique-names (att properties type) |
2b0fd9c8 | 104 | `(dolist* (,att ,attributes) |
f9b11956 | 105 | (let* ((,att (ensure-list ,att)) |
106 | (,properties (rest ,att)) | |
107 | (,type (getf ,properties :type)) | |
108 | (,var (let ((a (find-attribute ,description (first ,att)))) | |
109 | (if ,type | |
110 | (apply #'make-attribute :name (first ,att) :type ,type ,properties) | |
111 | (if a a (make-attribute :name (first ,att) :slot-name (first ,att))))))) | |
112 | (funcall-with-description ,var ,properties | |
113 | #'(lambda () | |
114 | ,@body)))))) | |
2b0fd9c8 DC |
115 | |
116 | (defmacro with-component ((component) &body body) | |
117 | `(let ((self ,component)) | |
118 | (declare (ignorable self)) | |
119 | (flet ((display* (thing &rest args) | |
120 | (apply #'display ,component thing args)) | |
1cc831d4 | 121 | (display-attribute (attribute obj &rest |
122 | props) | |
2b0fd9c8 DC |
123 | (if props |
124 | (funcall-with-description | |
125 | attribute props | |
126 | #'display-using-description attribute obj ,component) | |
127 | (display-using-description attribute obj ,component)))) | |
128 | (declare (ignorable #'display* #'display-attribute)) | |
129 | ,@body))) | |
130 | ||
131 | (defmacro defdisplay (&body body) | |
132 | (loop with in-layerp = (eq (car body) :in-layer) | |
133 | with layer = (if in-layerp (cadr body) 't) | |
134 | for tail on (if in-layerp (cddr body) body) | |
135 | until (listp (car tail)) | |
136 | collect (car tail) into qualifiers | |
137 | finally | |
138 | (when (member :in-layer qualifiers) | |
139 | (error "Incorrect occurrence of :in-layer in defdisplay. Must occur before qualifiers.")) | |
140 | (return | |
0386c736 | 141 | (destructuring-bind (description &optional object component) (car tail) |
2b0fd9c8 DC |
142 | (with-unique-names (d c) |
143 | (let (standard-description-p) | |
144 | `(define-layered-method | |
145 | display-using-description | |
146 | :in-layer ,layer | |
147 | ,@qualifiers | |
0386c736 | 148 | |
149 | ,@(unless object | |
150 | (setf object description) | |
151 | (setf description d) | |
152 | nil) | |
2b0fd9c8 DC |
153 | (,(cond |
154 | ((listp description) | |
155 | (setf d (car description)) | |
156 | description) | |
157 | (t | |
158 | (setf d description) | |
159 | (setf standard-description-p t) | |
160 | `(,d description))) | |
161 | ,object | |
162 | ,(cond | |
163 | ((null component) | |
164 | `(,c component)) | |
165 | ((listp component) | |
166 | (setf c (car component)) | |
167 | component) | |
168 | (t | |
169 | (setf c component) | |
1cc831d4 | 170 | `(,c t)))) |
2b0fd9c8 DC |
171 | (with-component (,c) |
172 | ,@(cdr tail))))))))) | |
173 | ||
174 |